We have this mixed environment and are currently migrating users to Windows 7 from Windows XP. For our XP machines we have a 2003 GPO that enforces a Wall Paper which is also centered. I noticed on 2 of the trial Win 7 machines that once we log into our accounts, UAC prompts and it is basically prompting to run the Registry command to center the wallpaper. We would like to be able to get this to work with Windows 7 without prompting UAC; we cannot have the users bothered with this each time they log in. What can I do to make this work without disabling UAC or auto elevating Admin accounts when UAC is prompted?